/* Example 15.1: Simple actions with pointers
	Author: Peter Brusilovsky 
*/

#include <stdio.h>

struct point {
	int x;
	int y;
};

struct point readpoint(char *prompt);

main(){
	struct point pbase, p;
	int i;
	
	/* get base point */
	pbase = readpoint("Enter base point");
	
	/* get and check points */
	for (i = 1; i <= 5; ++i) {
		p = readpoint("Enter point");
		if (p.y > pbase.y)
			printf("The point (%d, %d) is above (%d, %d)\n", 
				p.x, p.y, pbase.x, pbase.y);
		else if (p.y < pbase.y)
			printf("The point (%d, %d) is under (%d, %d)\n", 
				p.x, p.y, pbase.x, pbase.y);
		else
			printf("(%d, %d) is on the same level with (%d, %d)\n", 
				p.x, p.y, pbase.x, pbase.y);
	} 
	return 0;
}

/* readpoint: reads a point and returns it */
struct point readpoint(char *prompt)
{
	struct point input;
	
	printf("%s (x y):", prompt);
	scanf("%d %d", &(input.x), &(input.y));
	return input;
}